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    <title>web前端开发</title>
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    <a href="http://www.w3c.org">w3c组织</a><br />
    <a href="http://www.w3school.cn">w3school学习网站</a><br /> 
    <a href="vs.html">前端与后端</a>
    <h1>WEB前端开发</h1>
    <h5>web front-end development</h5>
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    <h2>基本概念</h2>
    <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Quis nesciunt animi ad facilis magni nam enim quae labore reprehenderit vel, impedit voluptatibus a placeat iste autem optio maiores doloremque nobis?</p> 
    <h2>技术构成</h2>
    <p>HTML</p>
    <p>CSS</p>
    <p>JS</p>
    <hr />
    <h6>copyright</h6>
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